390856079 has 4 divisors (see below), whose sum is σ = 398230776. Its totient is φ = 383481384.

The previous prime is 390856069. The next prime is 390856093. The reversal of 390856079 is 970658093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970658093 = 3023 ⋅321091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390856079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390856009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3687269 + ... + 3687374.

It is an arithmetic number, because the mean of its divisors is an integer number (99557694).

Almost surely, 2^390856079 is an apocalyptic number.

390856079 is a deficient number, since it is larger than the sum of its proper divisors (7374697).

390856079 is an equidigital number, since it uses as much as digits as its factorization.

390856079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374696.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 390856079 is about 19770.0803994319. The cubic root of 390856079 is about 731.1485510126.

The spelling of 390856079 in words is "three hundred ninety million, eight hundred fifty-six thousand, seventy-nine".